Hardness, tensile strength, breaking elongation ratio and aging property of samples were tested and surface of sample after aging was represented by SEM.

对试样进行了硬度、拉伸强度、断裂伸长率、热老化等性能试验；对老化后的试样表面进行了SEM表征。

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Expansive cement paste and joint concrete are next. And the bond splitting tensile strength of joint surface without bond material is least.

其次是水泥膨浆和接缝混凝土，接缝面不铺筑任何接缝面材料的试块，劈裂抗拉强度最小。

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Glass fiber encryption tensile strength increases, the more enhance bubble board with size, surface hardness and easy construction land mark fixed tube.

玻璃纤维加密抗张强度增大，更增强泡沫板硬度，表面带有尺寸标记，易于施工固定地热管。

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